In the video here, you can (just barely) see the bar at the base of the mechanism sliding in and out as the key is turned back and forth. With the right settings, and , that would be a pretty strong lock. Ttsalo didn’t stop there. Here’s a Fully Printable Padlock. On the Thingiverse page, he provides a lot of explanation about how to file and sand down certain elements of the whole mechanism make a fluid mechanism.

And now, for the pièce de résistance — no really, resistance — a Lockbox. What would fit in this? An engagement ring, maybe?

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